Machine for removing and replacing piston wrist pins



June 16, 1931. E. o. MINOR 1,810,884

MACHINE FOR REMOVING AND REPLACING PISTON WRIST PINS- Filed May 21. 1930 5 Sheets-Sheet 1 g; EarZa/yi'iwr INVENTOR N ATTORNEY June 16, 1931. E. o. WNOR 81m 84 MACHINE FOR REMOVING AND REPLACING PISTON WRIST PINS Filed May 21. 1930 5 Sheets-Sheet 2 i *1 k R Q w r 1 2 A X/ A & R

INVENTOR ATTORNEY E. O. MINOR June 16, 1931.

1,810,884 MACHINE FOR REMOVINGAND REPLACEN'G ifs'ron WRIST PINS Filed May 21. 193.0 3 Sheets-Sheet 3 ATTORNE Y Patented June 16, 1931 PATENT OFFICE 1 EARL 0. MINOR, or NEW YORK, 1v. Y.

' MACHINE roR REMOVING AND REPLA ING rrsrolv WRIST rnvs Application filed. May 21, 1930. Serial No. 454,427.

provision of a machinein which a single.

1 operation will remove an .old pin and replace a new onein' an efficient and expeditious manner, and which is capable of use with wrist pins having interlocking connection withconnecting rod bearings.

With the above and other objects in view, the-invention further includes the following novel features and details of construction, to be hereinafter more fully described. il-

lustrat'e'd inthe accompanying drawings and pointed outin the appended claims.

l nthedrawings r I Figure lis a top plan view of the machine with apiston in place and its connecting rod shown in section.

Figure 2 is a section on the line 2-2 of Fi ure 1.

higurefi is a section on the'line-3- -3 of Figure 1 1 Figure 4:- is a section on the line il of Figure2; Y

Fi ire 5' is an elevation of the reinforcing mem r. i

Figure- 6' is a view at right angles to Fig-r ure 5. Figure-7 is a detail view of an aligning bar for use with the invention. 7

Figure ,8 is a detail view of the pilot, Figure 9 is a like view of the wrist pin carrier.

Referring to the drawings in detail wherein l ke characters of reference denote corresponding parts, the reference character 10 indicates the base of the machine, upon which is removably mounted a piston holder v 11. This holder is in the form of a hollow cylinder and is removably attached to the base by means of bolts 12. The holder'is vertically split asshown at 13 and extending from the holder upon opposite sides'of the split are lugs 14. A screw 15- passes through these lugs and is provided with an operating handle 16', by means of which the size of thebore of the cylindermay be adjusted toaocommodate pistons of different sizes within a certain radius. The holder 11 "30 may be removed from" the base and another holder substituted for pistons of other sizes. The holder 11 is adapted to receive a pis-' ton 17 as shown in Figures 2, 3 and i of the drawings and the wrist pin bearings are brought into axial alignment with openings 18 provided in the holder. A suitable tool or aligning bar 19' may be employed for this purpose, although this bar is not cssential. The bar 19 is provided with a re- 79 duced extremity 20 which is adapted to pass through one of the openings 18 intothe wrist pin 21' carried by the piston, and will hold the, piston in proper position duringthe initial operation ofthe machine. 7

A reinforcing member 22 is-inserted within the piston and acts to back up and reinforce the piston walls, so that pressure necessary in removing or inserting wrist pins will not injure the walls of the piston. This reinforcing member is slotted. as shown at 23 for the accommodation of a connecting rod 2 1 and its bearing 25.

Rising from the base 10 is a bearing member 26, which isprovided with an internally threaded opening 27. feed screw 28 passes through this opening and threadedly engages the bearing, the screw being'axially aligned with the openings 18 of the piston holder. The screw 28 is provided with an operating handle 29 at'its outer end. The inner end of the screw is provided with a socket 30 which receives a reduced extremity 31pro' vided upon one end of a wrist pin carrier 32. 5 This carrier is provided with a collar 33 which bears against the end of the screw 28 and providesmeans whereby thescrew may rotate without rotating the-pin carrier. The pin carrier has its oppositeend beveled and 10B presses the latter outward, the new wrist pin provided with a shoulder 34 for engagement by'one end of a wrist pin 21a, the latter representing the new wrist pin to be inserted. V

The pin carrier 32 is also socketed at one end as shown at 35 and this socketed end receives the reduced end 36 of a pilot 37 This pilot is tapered and is adapted to be inserted in the end of the wrist pin 21. A head 38 of relatively large diameter is provided upon the end of the pilot 37 and the inner end of this head provides a shoulder 39cwhich abuts the adjacent end of the pin 21a. The outer end of the head 38 is semi-spherical as shown at 40.

After the piston has been positioned within the holder and the openings 18 and the wrist pin have been brought into axial alignment, the screw 28 is fed inward with the substitute wrist pin 21a mounted upon the carrier and the pilot positioned in advance of the wrist pin. The head 38 of the pilot engages the end of the old wrist'pin 21 and following the head into and through the piston and connecting rod bearings;

In the form of connecting rod bearings shown, a metal ring 11 is employed, and this ring must be expanded to permit the pin 21a to be inserted. This expanding action is effected by the rounded end 40 of the head 38 of the pilot, as will be seen from an inspection of Figure'2 of the drawings.

From the foregoing description and ac-' companying drawings, it will be seen that the piston is securely held in proper position with itswalls properly reinforced, so that the pressure necessary for removing an old pin and inserting a new pin may be employed without danger, to the piston. Where the metal rings 41 are used, the pin will be provided with circumferential notches 42, The reinforcing member 22 is provided with a handle 43. g c

It is preferred to heat the piston bysubmerging the same-in hot water priorto the removal and insertion of the pins.

The invention is susceptible of 'variou changes in its form, proportions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of the appended claims.

Having described the invention what is claimed is 1. In a wrist pin removing and replacing machine, a piston holder having openings therein and adapted to receive a piston, a reinforcing member adapted to be inserted within the piston to engage thevwalls thereof, a Wrist pin carrier mounted for longitudinal movement, means to move the carrier, and means supported by the carrier and located in advance of a wrist pin mounted upon said carrier to engage and force an old wrist pin pin mounted uponsaid carrier to engage and force anold wrist pin from the piston and provide a lead for the carrier mounted wrist pin.

a 3. In a wrist pin removing and replacing machine, a base, a memberrising from the base, and having a socket therein to. receive and provide a holder for the piston, said member having oppositely located openings therein, a reinforcing'member adapted to be' inserted within the piston to engage the walls thereof, a bearing member rising from the.

base, a feed screw engageable with, said 1116111:- ber and movable toward and away from the piston holder, a wrist pin carrier mounted,

at the outer end of the screw, and means sup,- ported by the carrier in advance ofa Wrist pin mounted upon said carrier to engage and force an old wrist pin from the piston and provide a pilot for the carrier mounted wrist pin.

1 4. In a wrist machine, a base, a member rising from the base and having a socket therein to receive and provide a holderfor at piston, said member having oppositely located openings therein, a reinforcing member adapted to be inserted vwithin the piston to engage the walls thereof, a bearing member rising from the r base, a feed screw engageable with said member and movable toward and away from the piston, holder and having an axially. disposed socket in one end, a wrist pin-carrier having. one end reduced and engageable within the said socket and its other 7 end adapted to be received within a:wristpi n a shoulder upon the carrier for engagement by one end of said pin, and means supported by the carrier and located in advance of a wrist pin mounted upon said carrier to engageand force an old wrist pin from the piston and provide a pilot for thecarrier mounted wrist pin.

5. In a wrist pin removing and replacing machine, a wrist pin holder including a split hollow cylindrical member adapted toreceive a piston, means engaging the holder-upon opposite sides of the split to adjust the diameter of the holder to accommodate pistons of different diameters, a reinforcing member adapted to be inserted within the piston to engage the walls thereof, a wrist pincarrier mounted forlongitudinal movement, means to move the carrier, andmeans supported by pin removing and replacing the carrier and-located in advance of a wrist pin mounted upon said carrier to engage and force an old wrist pin from the piston and 7 provide a pilot of the carrier mounted wrist pin.

In testimony whereof I affix my signature.

EARL O. MINOR. 

